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Recently, I replaced the radiator, the HVAC box and the blower fan resistor for good measure. The reason I replaced the HVAC box is because the heater matrix in mine sprung a small leak. Anyway, I bled the coolant tonight.

After bleeding, engine temp at fast idle stays at or below 192 degrees (ambient air temp is 65 degrees), so I'm happy there are no major air pockets left in the main coolant lines. After the thermostat opens, I can feel hot coolant in both radiator hoses. I purged air at the front and rear bleed valves a couple of times until air stopped coming out.

Here's the kicker. Both the "in" and "out" hoses at the HVAC box are COLD. I thought coolant is supposed to flow through them at all times? Does it sound like I have a big air bubble trapped in the lines to/from the HVAC box? If so, how do you purge air out of that part of the coolant system?
 
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